Nikola Tesla also invented levitational propulsion machines capable of neutralizing inertial forces, such as gravity.

He did this by way of making a modification to his TriMetal Generator by eliminating the iron winding and replacing it with aluminum. And by replacing the copper tubing and copper spheres with aluminum tubing and spheres. And also by arranging twelve spheres paired in twos for each of the three planes of space on two ends of a single large winding. The tubing connecting each pair of spheres had its own much smaller winding.

The idea is that aluminum is paramagnetic and will export its force to the exterior of the craft. The craft must possess nothing other than aluminum in its construction.

The smaller windings orient the craft's direction while the main winding propels it in that direction.

All of the windings come in pairs. Each gets shunted into it a proportional current by comparison to its partnered coil. Each winding is counter-wound with respect to its partner coil. Thus, force along an axis of 3D space can be controlled along with the orientation of the craft for directional flight.

Tesla used a pot belly stove for his prototype and attached his propulsion to the top-plate of the stove outside and safely away from himself sitting inside the stove and took short flights in and around New York city at night.

If you look up advertisements for pot belly stoves of one hundred years ago, you'll find that they were often made of aluminum as an alternative to cast iron. Some are just large enough for a tall, thin man like Tesla to rest inside of.